The progress on novel interconnects for carbon nanotube(CNT)-based electronic circuit is by far behind the remarkable development of CNT-field effect transistors.The Cu interconnect material used in current integrated circuits seems not applicable for the novel interconnects,as it requires electrochemical deposition followed by chemical-mechanical polishing.We report our experimental results on the failure current density,resistivity,electromigration effect and failure mechanism of patterned stripes of Pd,Sc and Y thin-films,regarding them as the potential novel interconnects.The Pd stripes have a failure current density of(8~10)×106 A/cm~2(MA/cm~2),and they are stable when the working current density is as much as 90% of the failure current density.However,they show a resistivity around 210 μΩ·cm,which is 20 times of the bulk value and leaving room for improvement.Compared to Pd,the Sc stripes have a similar resistivity but smaller failure current density of 4~5 MA/cm~2.Y stripes seem not suitable for interconnects by showing even lower failure current density than that of Sc and evidence of oxidation.For comparison,Au stripes of the same dimensions show a failure current density of 30 MA/cm~2 and a resistivity around 4 μΩ·cm,making them also a good material as novel interconnects.
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机译:碳纳米管基电子电路新型互连的进展远远落后于碳纳米管场效应晶体管的显着发展。当前集成电路中使用的铜互连材料似乎不适用于新型互连,因为它需要电化学我们报告了关于Pd,Sc和Y薄膜图案化条纹的失效电流密度,电阻率,电迁移效应和失效机理的实验结果,并将其视为潜在的新型互连。具有(8〜10)×106 A / cm〜2(MA / cm〜2)的故障电流密度,当工作电流密度高达故障电流密度的90%时它们是稳定的。显示出约210μΩ·cm的电阻率,是体积值的20倍,尚有待改进。与Pd相比,Sc条纹的电阻率相似,但故障电流密度较小,为4〜5 MA / cm〜2.Y条纹似乎相比之下,相同尺寸的Au条纹显示的故障电流密度为30 MA / cm〜2,电阻率约为4μΩ·cm,因此不适合用于互连,因为它的故障电流密度甚至低于Sc的故障电流密度和氧化迹象。使其成为新型互连的良好材料。
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